[systemd-devel] [PATCH] build-sys: add configure option to disable LTO/gold

[Cristian Rodríguez]

El 18/02/15 a las 15:58, Lennart Poettering escribió:
> On Wed, 18.02.15 15:45, Cristian Rodríguez (crrodriguez at opensuse.org) wrote:
>
>> LTO may be unreliable, does not work properly in several archs
>> It may crash or produce wrong code.
>
> Well, that's something to fix in the LTO code.
>
>> Compiler developers also said we should not provide production
>> RPM packages with LTO enabled.
>
> We have been doing that for a number of releases on Fedora. Seems to
> work fine.

Yes, it works in x86_64, except we need to produce working -debuginfo 
packages and LTO produces unusable debug infos..

Anyway,,currently this is not suitable for us at all. let me explain a 
bit...

Building systemd is affected by this GCC bug (not in fread but *poll)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61886

We can't just ignore the warnings like "warning: call to ‘__*_chk_warn’ 
declared with attribute warning: poll called with fds buffer too small 
file nfds entries" why ? The openSUSE buildsystem considers this 
warnings as security holes and the package is automatically marked as 
failed and is automatically rejected for inclusion.

So we currently disable LTO with a patch, not as nice as the one I posted.